#include <iostream>
#include <cstdio>

using namespace std;

void euclid(int a, int b, int &x, int &y, int &d)
{
    if (b == 0) {
        d = a;
        x = 1;
        y = 0;
    }
    else {
        int x0, y0;
        euclid(b, a%b, x0, y0, d);
        x = y0;
        y = x0 - y0*(a/b);
    }
}

int invers(int a, int n)
{
	int x, y, d;
    euclid(a, n, x, y, d);
    while (x < 0) x += n;
    return x % n;
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);

	int a, n;
	scanf("%d %d", &a, &n);

	int rez = invers(a, n);
	printf("%d", rez);

	return 0;
}